Preprint

PUBDB-2026-02345

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hadronic physics from a Wilson fermion mixed-action approach: setup and scale setting

Bussone, A. ; Conigli, A. ; Frison, J. F.DESY* ; Herdoiza, G.Extern* ; Pena, C.Extern* ; Preti, D.Extern* ; Romero, J. Á. ; Sáez, A. (Corresponding author) ; Ugarrio, J. ; ALPHA Collaboration (Collaboration author)

2026

This record in other databases:    

Please use a persistent id in citations: doi:10.3204/PUBDB-2026-02345

Report No.: IFT-UAM/CSIC-25-108; arXiv:2510.20450

Abstract: We introduce a lattice QCD mixed action approach that employs Wilson-type quarks in the sea and valence sectors. The sea sector is based on gauge ensembles with $N_\mathrm {\scriptstyle f}=2+1$ flavours of non-perturbatively O(a)-improved Wilson fermions generated by the Coordinated Lattice Simulations (CLS) initiative. The parameter space of the considered ensembles encompasses five values of the lattice spacing, a range of pion masses extending down to the physical point, and large physical volumes. In the valence sector, we employ Wilson twisted-mass fermions at maximal twist, using the same massless Wilson-Dirac operator in both the sea and valence sectors. We describe the strategy applied for the required matching of the sea and valence quark masses along the target renormalised chiral trajectory. A precise universality test is then conducted by comparing the continuum-limit results of the mixed-action approach and of the unitary setup, in which the same Wilson fermion regularisation is employed in the sea and in the valence. As a key application, we conduct a scale setting procedure based on lattice determinations of the masses and decay constants of the pion and kaon, as well as the gradient flow scale $t_0$. The scale setting can consequently be performed in three distinct ways, utilising the unitary setup, the mixed action approach, and their combination. We observe that the latter combination results in enhanced control of the systematic uncertainties, thereby yielding a precise determination of the physical value of $t_0$.

Note: 116 pages, 33 figures, 25 tables; v2: corrected typos and refinements in analysis; marginal changes in final results; conclusions unchanged; accepted for publication

---

Contributing Institute(s):

1. Zeuthen Particle PhysicsTheory (Z_ZPPT)

Research Program(s):

1. STRONG-2020 - The strong interaction at the frontier of knowledge: fundamental research and applications (824093) (824093)
2. EuroPLEx - European network for Particle physics, Lattice field theory and Extreme computing (813942) (813942)
3. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. No specific instrument

---

Database coverage:
; ; Published

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Bussone, A. ; Conigli, A. ; Frison, J. F.DESY* ; Herdoiza, G.Extern* ; Pena, C.Extern* ; Preti, D.Extern* ; Romero, J. Á. ; Sáez, A. (Corresponding author) ; Ugarrio, J. ; ALPHA Collaboration (Collaboration author)
Hadronic physics from a Wilson fermion mixed-action approach: setup and scale setting
The European physical journal / C 86(5), 577 (2026) [10.1140/epjc/s10052-026-15518-1]2026     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---